How Long Do You Have To Date Someone To Know If They Have Longterm Potential?

Butterflies on the first date aren't unusual. Neither is hooking up on the third one. But when, in a fledgling relationship should you know if it will have legs? While coasting isn't a great idea in a relationship, allowing yourself to be vulnerable and truly get to know one another generally can't be rushed. When is the appropriate time to know that what you have may end up working? Stan Tatkin and our panel of experts discuss.